In this day of seemingly everyone with a dyno chassis in the garage, people want to see documentation on all of these claims.
I certainly am no exception.
My only thought is that if we go back to the days of the 351C being run in things like Super Stock, FORD had a recommendation on header tube diameters, tube lengths, collector type, diameter and lengths.
I should add, that as far as I understand all of this interaction of variables in the head, cam and exhaust, what works on a Pro Stock is not necessarily going to have much effect if you are not using the same cam, heads, headers, etc.
For instance, if you have heads that flow 330 at .630" lift, if you have a cam that only has .550 lift, you aren't going to make the same power. The headers as well. Some of these mods are for maximum flow at maximum rpm and won't show necessarily on just a "street engine".
As I recall, my discussion with Pat mentioned all of that, he acknowledged that and I suppose used the FORD recommendation to "justify" his collector design?
As far as proving all of these claims on a dyno, don't go by me. My suggestion to you would be to call Pat himself and ask him about the data that he has on all of this.
If nothing else, the way the S starts as 3" and funnels down to 2-1/2" is going to catch everyone's eye.
Kind of like 'Grumpy Jenkins' pulling out the dipstick, holding it up to the sunlight, examining intensely what he sees, then watching everyone else do the same thing in 'copy cat' fashion?
The person to ask is Pat. Call him. He knows who you are.
